Re: [PATCH] iommu: fix ARM_SMMU vs QCOM_SCM compilation
On 10/9/21 9:33 PM, Dmitry Baryshkov wrote:
After commit 424953cf3c66 ("qcom_scm: hide Kconfig symbol") arm-smmu got
qcom_smmu_impl_init() call guarded by IS_ENABLED(CONFIG_ARM_SMMU_QCOM).
However the CONFIG_ARM_SMMU_QCOM Kconfig entry does not exist, so the
qcom_smmu_impl_init() is never called.
So, let's fix this by always calling qcom_smmu_impl_init(). It does not
touch the smmu passed unless the device is a non-Qualcomm one. Make
ARM_SMMU select QCOM_SCM for ARCH_QCOM.
Fixes: 424953cf3c66 ("qcom_scm: hide Kconfig symbol")
Cc: Arnd Bergmann
Reported-by: Daniel Lezcano
Signed-off-by: Dmitry Baryshkov
---
drivers/iommu/Kconfig | 1 +
drivers/iommu/arm/arm-smmu/Makefile| 3 +--
drivers/iommu/arm/arm-smmu/arm-smmu-impl.c | 9 +++--
3 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index c5c71b7ab7e8..a4593e53fe7d 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -309,6 +309,7 @@ config ARM_SMMU
tristate "ARM Ltd. System MMU (SMMU) Support"
depends on ARM64 || ARM || (COMPILE_TEST && !GENERIC_ATOMIC64)
select IOMMU_API
+ select QCOM_SCM
select IOMMU_IO_PGTABLE_LPAE
select ARM_DMA_USE_IOMMU if ARM
help
diff --git a/drivers/iommu/arm/arm-smmu/Makefile
b/drivers/iommu/arm/arm-smmu/Makefile
index b0cc01aa20c9..e240a7bcf310 100644
--- a/drivers/iommu/arm/arm-smmu/Makefile
+++ b/drivers/iommu/arm/arm-smmu/Makefile
@@ -1,5 +1,4 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_QCOM_IOMMU) += qcom_iommu.o
obj-$(CONFIG_ARM_SMMU) += arm_smmu.o
-arm_smmu-objs += arm-smmu.o arm-smmu-impl.o arm-smmu-nvidia.o
-arm_smmu-$(CONFIG_ARM_SMMU_QCOM) += arm-smmu-qcom.o
+arm_smmu-objs += arm-smmu.o arm-smmu-impl.o arm-smmu-nvidia.o arm-smmu-qcom.o
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
index 2c25cce38060..8199185dd262 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
@@ -215,8 +215,13 @@ struct arm_smmu_device *arm_smmu_impl_init(struct
arm_smmu_device *smmu)
of_device_is_compatible(np, "nvidia,tegra186-smmu"))
return nvidia_smmu_impl_init(smmu);
- if (IS_ENABLED(CONFIG_ARM_SMMU_QCOM))
- smmu = qcom_smmu_impl_init(smmu);
+ /*
+* qcom_smmu_impl_init() will not touch smmu if the device is not
+* a Qualcomm one.
+*/
+ smmu = qcom_smmu_impl_init(smmu);
+ if (IS_ERR(smmu))
+ return smmu;
if (of_device_is_compatible(np, "marvell,ap806-smmu-500"))
smmu->impl = _mmu500_impl;
Without this applied, my Lenovo Yoga C630 just boot loops with
424953cf3c66 applied when it gets to the smmu. This fixes it.
Tested-By: Steev Klimaszewski
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Re: [PATCH] iommu: fix ARM_SMMU vs QCOM_SCM compilation
On Sat 09 Oct 21:33 CDT 2021, Dmitry Baryshkov wrote:
> After commit 424953cf3c66 ("qcom_scm: hide Kconfig symbol") arm-smmu got
> qcom_smmu_impl_init() call guarded by IS_ENABLED(CONFIG_ARM_SMMU_QCOM).
> However the CONFIG_ARM_SMMU_QCOM Kconfig entry does not exist, so the
> qcom_smmu_impl_init() is never called.
>
> So, let's fix this by always calling qcom_smmu_impl_init(). It does not
> touch the smmu passed unless the device is a non-Qualcomm one. Make
> ARM_SMMU select QCOM_SCM for ARCH_QCOM.
>
Arnd's intention was to not force QCOM_SCM to be built on non-Qualcomm
devices. But as Daniel experienced, attempting to boot most Qualcomm
boards without this results in a instant reboot.
I think it's okay if we tinker with CONFIG_ARM_SMMU_QCOM for v5.16, but
we're getting late in v5.15 so I would prefer if we make sure this works
out of the box.
Reviewed-by: Bjorn Andersson
Regards,
Bjorn
> Fixes: 424953cf3c66 ("qcom_scm: hide Kconfig symbol")
> Cc: Arnd Bergmann
> Reported-by: Daniel Lezcano
> Signed-off-by: Dmitry Baryshkov
> ---
> drivers/iommu/Kconfig | 1 +
> drivers/iommu/arm/arm-smmu/Makefile| 3 +--
> drivers/iommu/arm/arm-smmu/arm-smmu-impl.c | 9 +++--
> 3 files changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
> index c5c71b7ab7e8..a4593e53fe7d 100644
> --- a/drivers/iommu/Kconfig
> +++ b/drivers/iommu/Kconfig
> @@ -309,6 +309,7 @@ config ARM_SMMU
> tristate "ARM Ltd. System MMU (SMMU) Support"
> depends on ARM64 || ARM || (COMPILE_TEST && !GENERIC_ATOMIC64)
> select IOMMU_API
> + select QCOM_SCM
> select IOMMU_IO_PGTABLE_LPAE
> select ARM_DMA_USE_IOMMU if ARM
> help
> diff --git a/drivers/iommu/arm/arm-smmu/Makefile
> b/drivers/iommu/arm/arm-smmu/Makefile
> index b0cc01aa20c9..e240a7bcf310 100644
> --- a/drivers/iommu/arm/arm-smmu/Makefile
> +++ b/drivers/iommu/arm/arm-smmu/Makefile
> @@ -1,5 +1,4 @@
> # SPDX-License-Identifier: GPL-2.0
> obj-$(CONFIG_QCOM_IOMMU) += qcom_iommu.o
> obj-$(CONFIG_ARM_SMMU) += arm_smmu.o
> -arm_smmu-objs += arm-smmu.o arm-smmu-impl.o arm-smmu-nvidia.o
> -arm_smmu-$(CONFIG_ARM_SMMU_QCOM) += arm-smmu-qcom.o
> +arm_smmu-objs += arm-smmu.o arm-smmu-impl.o arm-smmu-nvidia.o arm-smmu-qcom.o
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
> b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
> index 2c25cce38060..8199185dd262 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
> @@ -215,8 +215,13 @@ struct arm_smmu_device *arm_smmu_impl_init(struct
> arm_smmu_device *smmu)
> of_device_is_compatible(np, "nvidia,tegra186-smmu"))
> return nvidia_smmu_impl_init(smmu);
>
> - if (IS_ENABLED(CONFIG_ARM_SMMU_QCOM))
> - smmu = qcom_smmu_impl_init(smmu);
> + /*
> + * qcom_smmu_impl_init() will not touch smmu if the device is not
> + * a Qualcomm one.
> + */
> + smmu = qcom_smmu_impl_init(smmu);
> + if (IS_ERR(smmu))
> + return smmu;
>
> if (of_device_is_compatible(np, "marvell,ap806-smmu-500"))
> smmu->impl = _mmu500_impl;
> --
> 2.30.2
>
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[PATCH] iommu: fix ARM_SMMU vs QCOM_SCM compilation
After commit 424953cf3c66 ("qcom_scm: hide Kconfig symbol") arm-smmu got
qcom_smmu_impl_init() call guarded by IS_ENABLED(CONFIG_ARM_SMMU_QCOM).
However the CONFIG_ARM_SMMU_QCOM Kconfig entry does not exist, so the
qcom_smmu_impl_init() is never called.
So, let's fix this by always calling qcom_smmu_impl_init(). It does not
touch the smmu passed unless the device is a non-Qualcomm one. Make
ARM_SMMU select QCOM_SCM for ARCH_QCOM.
Fixes: 424953cf3c66 ("qcom_scm: hide Kconfig symbol")
Cc: Arnd Bergmann
Reported-by: Daniel Lezcano
Signed-off-by: Dmitry Baryshkov
---
drivers/iommu/Kconfig | 1 +
drivers/iommu/arm/arm-smmu/Makefile| 3 +--
drivers/iommu/arm/arm-smmu/arm-smmu-impl.c | 9 +++--
3 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index c5c71b7ab7e8..a4593e53fe7d 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -309,6 +309,7 @@ config ARM_SMMU
tristate "ARM Ltd. System MMU (SMMU) Support"
depends on ARM64 || ARM || (COMPILE_TEST && !GENERIC_ATOMIC64)
select IOMMU_API
+ select QCOM_SCM
select IOMMU_IO_PGTABLE_LPAE
select ARM_DMA_USE_IOMMU if ARM
help
diff --git a/drivers/iommu/arm/arm-smmu/Makefile
b/drivers/iommu/arm/arm-smmu/Makefile
index b0cc01aa20c9..e240a7bcf310 100644
--- a/drivers/iommu/arm/arm-smmu/Makefile
+++ b/drivers/iommu/arm/arm-smmu/Makefile
@@ -1,5 +1,4 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_QCOM_IOMMU) += qcom_iommu.o
obj-$(CONFIG_ARM_SMMU) += arm_smmu.o
-arm_smmu-objs += arm-smmu.o arm-smmu-impl.o arm-smmu-nvidia.o
-arm_smmu-$(CONFIG_ARM_SMMU_QCOM) += arm-smmu-qcom.o
+arm_smmu-objs += arm-smmu.o arm-smmu-impl.o arm-smmu-nvidia.o arm-smmu-qcom.o
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
index 2c25cce38060..8199185dd262 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
@@ -215,8 +215,13 @@ struct arm_smmu_device *arm_smmu_impl_init(struct
arm_smmu_device *smmu)
of_device_is_compatible(np, "nvidia,tegra186-smmu"))
return nvidia_smmu_impl_init(smmu);
- if (IS_ENABLED(CONFIG_ARM_SMMU_QCOM))
- smmu = qcom_smmu_impl_init(smmu);
+ /*
+* qcom_smmu_impl_init() will not touch smmu if the device is not
+* a Qualcomm one.
+*/
+ smmu = qcom_smmu_impl_init(smmu);
+ if (IS_ERR(smmu))
+ return smmu;
if (of_device_is_compatible(np, "marvell,ap806-smmu-500"))
smmu->impl = _mmu500_impl;
--
2.30.2
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Re: [PATCH v7 9/9] iommu/dma: Reserve any RMR regions associated with a dev
On Fri, Oct 8, 2021 at 3:10 PM Robin Murphy wrote:
>
> On 2021-08-05 09:07, Shameer Kolothum wrote:
> > Get ACPI IORT RMR regions associated with a dev reserved
> > so that there is a unity mapping for them in SMMU.
>
> This feels like most of it belongs in the IORT code rather than
> iommu-dma (which should save the temporary list copy as well).
See previous comment. The original intent was for device-tree to also
be able to use these mechanisms to create RMR's and support them
in the SMMU.
-Jon
>
> Robin.
>
> > Signed-off-by: Shameer Kolothum
> > ---
> > drivers/iommu/dma-iommu.c | 56 +++
> > 1 file changed, 51 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
> > index 1b6e27475279..c1ae0c3d4b33 100644
> > --- a/drivers/iommu/dma-iommu.c
> > +++ b/drivers/iommu/dma-iommu.c
> > @@ -207,22 +207,68 @@ void iommu_dma_put_rmrs(struct fwnode_handle
> > *iommu_fwnode,
> > }
> > EXPORT_SYMBOL(iommu_dma_put_rmrs);
> >
> > +static bool iommu_dma_dev_has_rmr(struct iommu_fwspec *fwspec,
> > + struct iommu_resv_region *e)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < fwspec->num_ids; i++) {
> > + if (e->fw_data.rmr.sid == fwspec->ids[i])
> > + return true;
> > + }
> > +
> > + return false;
> > +}
> > +
> > +static void iommu_dma_get_rmr_resv_regions(struct device *dev,
> > +struct list_head *list)
> > +{
> > + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
> > + struct list_head rmr_list;
> > + struct iommu_resv_region *rmr, *tmp;
> > +
> > + INIT_LIST_HEAD(_list);
> > + if (iommu_dma_get_rmrs(fwspec->iommu_fwnode, _list))
> > + return;
> > +
> > + if (dev_is_pci(dev)) {
> > + struct pci_dev *pdev = to_pci_dev(dev);
> > + struct pci_host_bridge *host =
> > pci_find_host_bridge(pdev->bus);
> > +
> > + if (!host->preserve_config)
> > + return;
> > + }
> > +
> > + list_for_each_entry_safe(rmr, tmp, _list, list) {
> > + if (!iommu_dma_dev_has_rmr(fwspec, rmr))
> > + continue;
> > +
> > + /* Remove from iommu RMR list and add to dev resv_regions */
> > + list_del_init(>list);
> > + list_add_tail(>list, list);
> > + }
> > +
> > + iommu_dma_put_rmrs(fwspec->iommu_fwnode, _list);
> > +}
> > +
> > /**
> >* iommu_dma_get_resv_regions - Reserved region driver helper
> >* @dev: Device from iommu_get_resv_regions()
> >* @list: Reserved region list from iommu_get_resv_regions()
> >*
> >* IOMMU drivers can use this to implement their .get_resv_regions
> > callback
> > - * for general non-IOMMU-specific reservations. Currently, this covers
> > GICv3
> > - * ITS region reservation on ACPI based ARM platforms that may require HW
> > MSI
> > - * reservation.
> > + * for general non-IOMMU-specific reservations. Currently this covers,
> > + * -GICv3 ITS region reservation on ACPI based ARM platforms that may
> > + * require HW MSI reservation.
> > + * -Any ACPI IORT RMR memory range reservations (IORT spec rev E.b)
> >*/
> > void iommu_dma_get_resv_regions(struct device *dev, struct list_head
> > *list)
> > {
> >
> > - if (!is_of_node(dev_iommu_fwspec_get(dev)->iommu_fwnode))
> > + if (!is_of_node(dev_iommu_fwspec_get(dev)->iommu_fwnode)) {
> > iort_iommu_msi_get_resv_regions(dev, list);
> > -
> > + iommu_dma_get_rmr_resv_regions(dev, list);
> > + }
> > }
> > EXPORT_SYMBOL(iommu_dma_get_resv_regions);
> >
> >
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Re: [PATCH v7 2/9] ACPI/IORT: Add support for RMR node parsing
On Fri, Oct 8, 2021 at 2:49 PM Robin Murphy wrote:
>
> On 2021-08-05 09:07, Shameer Kolothum wrote:
> > Add support for parsing RMR node information from ACPI.
> >
> > Find the associated streamid and smmu node info from the
> > RMR node and populate a linked list with RMR memory
> > descriptors.
> >
> > Signed-off-by: Shameer Kolothum
> > ---
> > drivers/acpi/arm64/iort.c | 134 +-
> > 1 file changed, 133 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> > index 3b23fb775ac4..d76ba46ebe67 100644
> > --- a/drivers/acpi/arm64/iort.c
> > +++ b/drivers/acpi/arm64/iort.c
> > @@ -40,6 +40,8 @@ struct iort_fwnode {
> > static LIST_HEAD(iort_fwnode_list);
> > static DEFINE_SPINLOCK(iort_fwnode_lock);
> >
> > +static LIST_HEAD(iort_rmr_list); /* list of RMR regions from ACPI */
> > +
> > /**
> >* iort_set_fwnode() - Create iort_fwnode and use it to register
> >* iommu data in the iort_fwnode_list
> > @@ -393,7 +395,8 @@ static struct acpi_iort_node *iort_node_get_id(struct
> > acpi_iort_node *node,
> > if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT ||
> > node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX ||
> > node->type == ACPI_IORT_NODE_SMMU_V3 ||
> > - node->type == ACPI_IORT_NODE_PMCG) {
> > + node->type == ACPI_IORT_NODE_PMCG ||
> > + node->type == ACPI_IORT_NODE_RMR) {
> > *id_out = map->output_base;
> > return parent;
> > }
> > @@ -1566,6 +1569,134 @@ static void __init iort_enable_acs(struct
> > acpi_iort_node *iort_node)
> > #else
> > static inline void iort_enable_acs(struct acpi_iort_node *iort_node) { }
> > #endif
> > +static void iort_rmr_desc_check_overlap(struct acpi_iort_rmr_desc *desc,
> > u32 count)
> > +{
> > + int i, j;
> > +
> > + for (i = 0; i < count; i++) {
> > + u64 end, start = desc[i].base_address, length =
> > desc[i].length;
> > +
> > + end = start + length - 1;
> > +
> > + /* Check for address overlap */
> > + for (j = i + 1; j < count; j++) {
> > + u64 e_start = desc[j].base_address;
> > + u64 e_end = e_start + desc[j].length - 1;
> > +
> > + if (start <= e_end && end >= e_start)
> > + pr_err(FW_BUG "RMR descriptor[0x%llx -
> > 0x%llx] overlaps, continue anyway\n",
> > +start, end);
> > + }
> > + }
> > +}
> > +
> > +static void __init iort_node_get_rmr_info(struct acpi_iort_node *iort_node)
> > +{
> > + struct acpi_iort_node *smmu;
> > + struct acpi_iort_rmr *rmr;
> > + struct acpi_iort_rmr_desc *rmr_desc;
> > + u32 map_count = iort_node->mapping_count;
> > + u32 sid;
> > + int i;
> > +
> > + if (!iort_node->mapping_offset || map_count != 1) {
> > + pr_err(FW_BUG "Invalid ID mapping, skipping RMR node %p\n",
> > +iort_node);
> > + return;
> > + }
> > +
> > + /* Retrieve associated smmu and stream id */
> > + smmu = iort_node_get_id(iort_node, , 0);
> > + if (!smmu) {
> > + pr_err(FW_BUG "Invalid SMMU reference, skipping RMR node
> > %p\n",
> > +iort_node);
> > + return;
> > + }
> > +
> > + /* Retrieve RMR data */
> > + rmr = (struct acpi_iort_rmr *)iort_node->node_data;
> > + if (!rmr->rmr_offset || !rmr->rmr_count) {
> > + pr_err(FW_BUG "Invalid RMR descriptor array, skipping RMR
> > node %p\n",
> > +iort_node);
> > + return;
> > + }
> > +
> > + rmr_desc = ACPI_ADD_PTR(struct acpi_iort_rmr_desc, iort_node,
> > + rmr->rmr_offset);
> > +
> > + iort_rmr_desc_check_overlap(rmr_desc, rmr->rmr_count);
> > +
> > + for (i = 0; i < rmr->rmr_count; i++, rmr_desc++) {
> > + struct iommu_resv_region *region;
> > + enum iommu_resv_type type;
> > + int prot = IOMMU_READ | IOMMU_WRITE;
> > + u64 addr = rmr_desc->base_address, size = rmr_desc->length;
> > +
> > + if (!IS_ALIGNED(addr, SZ_64K) || !IS_ALIGNED(size, SZ_64K)) {
> > + /* PAGE align base addr and size */
> > + addr &= PAGE_MASK;
> > + size = PAGE_ALIGN(size +
> > offset_in_page(rmr_desc->base_address));
> > +
> > + pr_err(FW_BUG "RMR descriptor[0x%llx - 0x%llx] not
> > aligned to 64K, continue with [0x%llx - 0x%llx]\n",
> > +rmr_desc->base_address,
> > +rmr_desc->base_address + rmr_desc->length - 1,
> > +addr, addr + size - 1);
> > + }
> > + if (rmr->flags &
Re: [PATCH v7 1/9] iommu: Introduce a union to struct iommu_resv_region
On Fri, Oct 8, 2021 at 2:14 PM Robin Murphy wrote:
>
> On 2021-08-05 09:07, Shameer Kolothum wrote:
> > A union is introduced to struct iommu_resv_region to hold
> > any firmware specific data. This is in preparation to add
> > support for IORT RMR reserve regions and the union now holds
> > the RMR specific information.
> >
> > Signed-off-by: Shameer Kolothum
> > ---
> > include/linux/iommu.h | 11 +++
> > 1 file changed, 11 insertions(+)
> >
> > diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> > index 32d448050bf7..bd0e4641c569 100644
> > --- a/include/linux/iommu.h
> > +++ b/include/linux/iommu.h
> > @@ -114,6 +114,13 @@ enum iommu_resv_type {
> > IOMMU_RESV_SW_MSI,
> > };
> >
> > +struct iommu_iort_rmr_data {
> > +#define IOMMU_RMR_REMAP_PERMITTED(1 << 0)
> > + u32 flags;
> > + u32 sid;/* Stream Id associated with RMR entry */
> > + void *smmu; /* Associated IORT SMMU node pointer */
> > +};
>
> Do we really need to duplicate all this data? AFAICS we could just save
> the acpi_iort_rmr pointer in the iommu_resv_region (with a forward
> declaration here if necessary) and defer parsing its actual mappings
> until the point where we can directly consume the results.
>From earlier discussions on this patchset, the original goal was also for
device-tree mechanisms to be able to hook into this code to support
similar RMR's and SMMU initialization, just not through the ACPI / IORT
path.
>
> Robin.
>
> > +
> > /**
> >* struct iommu_resv_region - descriptor for a reserved memory region
> >* @list: Linked list pointers
> > @@ -121,6 +128,7 @@ enum iommu_resv_type {
> >* @length: Length of the region in bytes
> >* @prot: IOMMU Protection flags (READ/WRITE/...)
> >* @type: Type of the reserved region
> > + * @rmr: ACPI IORT RMR specific data
> >*/
> > struct iommu_resv_region {
> > struct list_headlist;
> > @@ -128,6 +136,9 @@ struct iommu_resv_region {
> > size_t length;
> > int prot;
> > enum iommu_resv_typetype;
> > + union {
> > + struct iommu_iort_rmr_data rmr;
> > + } fw_data;
> > };
> >
> > /**
> >
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